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Fair Value of Derivative and Other Financial Instruments - Narrative (Details)	3 Months Ended		4 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Feb. 28, 2025 MW	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) MW
Debt Securities, Available-for-sale [Line Items]
Obligations to return cash	$ 0			$ 0		$ 0
Public Service Company of New Mexico
Debt Securities, Available-for-sale [Line Items]
Amounts recognized for right to reclaim cash	0			0		0
Cash collateral under margin arrangements	0			0		100,000
Available-for-sale debt securities	50,520,000			50,520,000
(Increase)/decrease in other than temporary losses of available-for-sale securities, net portion recognized in earnings	0	$ 1,600,000		0	$ 15,000,000.0
Public Service Company of New Mexico | Recurring
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities	426,671,000			426,671,000		453,421,000
Public Service Company of New Mexico | Recurring | Nuclear Decommissioning Trust
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities	407,000,000.0			407,000,000.0		384,600,000
Public Service Company of New Mexico | Recurring | SJGS Decommissioning Trust
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities	4,000,000			4,000,000		8,200,000
Public Service Company of New Mexico | Recurring | Mine Reclamation Trust
Debt Securities, Available-for-sale [Line Items]
Available-for-sale debt securities	$ 76,000,000			$ 76,000,000		$ 82,700,000
Portfolio One | Public Service Company of New Mexico
Debt Securities, Available-for-sale [Line Items]
Number of megawatts available in purchase power agreement (in megawatts) | MW			250			150
Portfolio Two | Public Service Company of New Mexico
Debt Securities, Available-for-sale [Line Items]
Number of megawatts available in purchase power agreement (in megawatts) | MW						100

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